From 2f0c2ad18b88691496e23d1ddbc2d0af8f6df5fa Mon Sep 17 00:00:00 2001
From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu, 29 Nov 2012 15:59:35 +0100
Subject: drm/i915: drop unnecessary clearing of pch dp transcoder timings
Git-repo: git://people.freedesktop.org/~danvet/drm-intel
Git-commit: 2f0c2ad18b88691496e23d1ddbc2d0af8f6df5fa
Patch-mainline: v3.9-rc1

This has originally been added in

commit 8db9d77b1b14fd730561f64beea8c00e4478d7c5
Author: Zhenyu Wang <zhenyuw@linux.intel.com>
Date:   Wed Apr 7 16:15:54 2010 +0800

    drm/i915: Support for Cougarpoint PCH display pipeline

probably to combat issues with hw state left behind by the BIOS. And
indeed, I've checked out that specific revision, and there is no DP
support yet. So the pch dp transcoder won't be correctly disabled, and
that's important since it requires a rether special disable dance:
Just writing 0 to TRANS_DP_CTL won't cut it, since we need to select
the NONE port when disabling, too.

And indeed, things seem to still work, so let's just remove this.

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Michal Srb <msrb@suse.com>
---
 drivers/gpu/drm/i915/intel_display.c |    9 +--------
 1 files changed, 1 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index f3e58a4..953796c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5345,15 +5345,8 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
 	} else
 		intel_put_pch_pll(intel_crtc);
 
-	if (is_dp && !is_cpu_edp) {
+	if (is_dp && !is_cpu_edp)
 		intel_dp_set_m_n(crtc, mode, adjusted_mode);
-	} else {
-		/* For non-DP output, clear any trans DP clock recovery setting.*/
-		I915_WRITE(TRANSDATA_M1(pipe), 0);
-		I915_WRITE(TRANSDATA_N1(pipe), 0);
-		I915_WRITE(TRANSDPLINK_M1(pipe), 0);
-		I915_WRITE(TRANSDPLINK_N1(pipe), 0);
-	}
 
 	for_each_encoder_on_crtc(dev, crtc, encoder)
 		if (encoder->pre_pll_enable)

